96 H.O. swap Trans not shifting right
So quick back story. I bought this 87 MJ a few months back. It has the motor(built) aw4 full harness and dash from a 96 or 97 Cherokee. Jeep runs like a top and is a fun toy, however the shifting is an issue.
If I put it in drive it hits 4th gear before 10mph. If I shift it manually it’s fine. No slipping or burning. Handles and drives well off road but I want to fix the auto shift issue.
I did notice the tcm harness has some wires tapped in but I’m not sure where they go. I’m at wits end and have search for hours over different forums. Any insight would be greatly appreciated.
1987 MJ Built 4.0 and auto swap from a 96
4.5 Short arm lift
4.88 gears Eaton e locker rear & lunchbox front